CN102886888B - Internal exhaust type parallel counter-rotating multi-screw extruder - Google Patents

Internal exhaust type parallel counter-rotating multi-screw extruder Download PDF

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Publication number
CN102886888B
CN102886888B CN201210406352.8A CN201210406352A CN102886888B CN 102886888 B CN102886888 B CN 102886888B CN 201210406352 A CN201210406352 A CN 201210406352A CN 102886888 B CN102886888 B CN 102886888B
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Prior art keywords
screw
screw rod
exhaust
driving
threads
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Expired - Fee Related
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CN201210406352.8A
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Chinese (zh)
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CN102886888A (en
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金世源
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Individual
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • B29C48/64Screws with two or more threads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/42Non-identical or non-mirrored screws

Abstract

The invention discloses an internal exhaust type parallel counter-rotating multi-screw extruder and relates to extrusion molding equipment using at least two screw rods which are not meshed with each other. The internal exhaust type parallel counter-rotating multi-screw extruder has the advantages of high extrusion pressure, enhanced plasticizing capacity, reduced energy consumption, remarkable energy saving effect, good feeding performance, exhaust performance and material overflowing prevention performance, and convenience in screw machining, and is suitable for various plastic and rubber machining. The internal exhaust type parallel counter-rotating multi-screw extruder is structurally characterized in that the left end of a main screw rod has a hollow structure, the built-in left end is fixed on an inner screw rod on an end cover, the direction of threads on the inner screw rod is opposite to that of threads on the main screw rod, the right end of the main screw rod is internally provided with an exhaust channel which is communicated with an exhaust channel in the inner screw rod, threads on the main screw rod corresponding to an auxiliary screw rod are single threads, other threads on the main screw rod are double threads, a first through hole connected with the exhaust channel is arranged in the main screw rod between two screw arrises of the double threads, a plurality of second through holes are arranged between the two screw arrises of the double threads on the main screw rod outside the inner screw rod, the end cover is provided with a melt outlet communicated with a cavity between the main screw rod and the inner screw rod, and the center of the end cover is provided with an exhaust port connected with the exhaust channel.

Description

The parallel incorgruous multi-screw extruder of exhaust in a kind of
Technical field
the invention belongs to plastic extruding forming technical field, particularly, relate to the improvement of the extrusion equipment structure of a kind of use at least two mutual non-engaging spiro rods, be i.e. a kind of interior parallel incorgruous multi-screw extruder of exhaust.
Background technology
at present, in plastics or rubber processing, the extruder of application is divided into by screw rod quantity: elastirotor extruder, single screw extrusion machine, double screw extruder, multi-screw extruder.Conventional has: single screw extrusion machine, parallel equidirectional two-screw extruder, parallel counter rotation twin screw extruder, conical parallel dual-screw extruding machine, taper counter rotation twin screw extruder, non-intermeshing counter rotating twin screw extruder and step extruder.
single screw extrusion machine advantage is that head pressure is high, extrude steadily, but plasticizing efficiency is low, material feeding poor performance.With reference to Chinese invention patent application: single screw extrusion machine, number of patent application: 201110275773.7, the invention provides a kind of single screw extrusion machine, comprise reduction box, screw rod, machine barrel, screw rod is connected with reduction gearbox output shaft, and the periphery of screw rod is processed with screw thread sheet, machine barrel is provided with charging aperture and discharging opening, screw rod has feed zone, compression section and metering section, the feeder of screw rod is positioned at the gating location place of machine barrel, and the discharging portion of screw rod is positioned at the discharging opening of machine barrel.
the advantage of parallel equidirectional two-screw extruder is that plasticizing capacity is good, and its shortcoming is that extrusion pressure is little, distributor box complex structure, and power consumption is large.With reference to Chinese utility model patent: engaged parallel same-directional double-screw exturding machine, the patent No.: 02228373.0, it discloses the parallel screw extruder in the same way of a kind of engagement, it comprises transmission device, feeding and extrusion device, it is characterized in that: extrusion device is made up of barrel homodromal twin-screw element parallel with the engagement be contained in barrel, screw element is by screw shaft, screwing element, left-hand thread element and kneading member composition, at the discharging opening of barrel, gear pump and extrusion die are housed successively, screwing element, left-hand thread element, kneading member is connected in turn on screw shaft by involute spline.
and parallel counter rotation twin screw extruder is all not good on plasticizing capacity and extrusion pressure, but material feeding performance is good.With reference to Chinese invention patent: Heterodromy double-screw extruder, the patent No.: 200580051075.1, a kind of screw extruder, described screw extruder has: body, the chamber of two cylinders of the rotor of its formation accommodation two counter rotatings, axis being parallel; Charging aperture, its one end at described body is used for the material to be mixed in chamber; Discharge port, it is for discharging composite material at the other end of described body; The delivery section with screw rod on each rotor, it is for being supplied to the mixing section comprising at least two mixed zones to downstream from described charging aperture by material, each mixed zone has at least one forward pass wing and at least one is positioned at the rear biography wing in described forward pass wing downstream, it is characterized in that: choke valve is arranged in the chamber in described mixing section downstream, and be arranged on the downstream of described choke valve with the second delivery section of screw rod and the second mixing section.
the advantage of taper counter rotation twin screw extruder is that extrusion pressure is medium, and shortcoming is that plasticizing capacity is poor, equipment difficulty of processing is large.With reference to Chinese utility model patent: conical parallel dual-screw extruding machine, the patent No.: 200420118947.4, a kind of conical parallel dual-screw extruding machine of this disclosure of the invention, it is by drive motors, shaft coupling, deceleration distributor box, feed system, machine barrel, conical double-screw, gas extraction system, pelletizing system, hoppers etc. formed, and are provided with the main conical screw of two equidirectional rotations and secondary conical screw in machine barrel, they are connected with driven gear with the driving gear in deceleration distributor box respectively, are also provided with idler gear in the below of two gears.
non-intermeshing counter rotating twin screw extruder plasticizing capacity is poor, but material feeding performance is good; Step extruder floor space is large, energy consumption is large, thus all unsatisfactory in actual use.
as can be seen here, plasticizing capacity, exhaust performance and extrusion pressure restrict mutually in an extruder.But plasticizing capacity is poor, directly will have influence on the quality of the rear product of plasticizing, and plasticating capacity has influence on again output and cost.Whether design a kind of extruder for this reason, collect above-mentioned advantage, and go its shortcoming, break through the defect of present extruder, multi-functional optimum organization, be applicable to the processing of multiple plastics, seem have very important economic worth and application value.
Summary of the invention
the present invention is exactly for the problems referred to above, make up the deficiencies in the prior art, there is provided that a kind of extrusion pressure is large, plasticizing capacity strengthens, energy consumption reduces, energy-saving effect significantly, good, good, the anti-risk material property of exhaust performance of material feeding performance can good, screw rod is easy to process, and is applicable to the parallel incorgruous multi-screw extruder of interior exhaust of various plastics and rubber processing.
for realizing above-mentioned purpose of the present invention, the present invention adopts following technical scheme.
the present invention includes frame, frame is arranged drive motors and reduction box, reduction box is connected with the distributor box on the left of it by shaft coupling, drawing-in device on distributor box is corresponding to the top of hopper, the below of hopper is corresponding to the feed end of machine barrel on the left of distributor box, the discharge end of machine barrel is provided with end cap, the built-in driving screw of machine barrel and that be positioned at feed end, contrary with driving screw hand of spiral sub-screw, and driving screw and sub-screw are connected with the driving gear in distributor box and driven gear respectively; Its structural feature is: the left end of driving screw is hollow structure, and built-in left end is fixed on the inner screw on end cap, and the screw thread of inner screw is contrary with the hand of spiral of driving screw; Have exhaust passage in the right-hand member of driving screw, described exhaust passage communicates with the exhaust passage in inner screw; Screw thread on the driving screw corresponding to sub-screw is single thread, and in addition, on driving screw, screw thread is two screw threads; Driving screw between two spiral shell ribs of two screw thread is provided with the first through hole that same exhaust passage is connected, between two spiral shell ribs of the two screw thread of the driving screw outside inner screw, is provided with some second through holes; End cap is provided with the melt outlet communicated with cavity between driving screw and inner screw, and the exhaust outlet be connected with exhaust passage.
further, the screw thread on sub-screw is single thread, and sub-screw and driving screw are incorgruous interior rotation; Because the driving screw that is parallel to each other and sub-screw reach incorgruous interior rotation, add material feeding and compression performance, thus improve fixing conveying capacity and anti-overflow ability.
further, sub-screw is short screw, and is that non-engagement is installed with driving screw, increases screw channel basal area, improves inlet amount.
as a preferred embodiment of the present invention, the screw thread of described inner screw is single thread, increases screw channel basal area, improves extrusion capacity.
helical pitch on described driving screw between adjacent two pairs of screw threads is equal with the helical pitch between adjacent two single threads, forms exhaust and melt canal.
in addition, driving screw is selected the thrust bearing of large gauge combine, because sub-screw is shorter, for about 1/4th of driving screw length, sub-screw is then selected low thrust bearing combine, so that the large extrusion pressure of parallel incorgruous screw rod can be born, ensure that the dependability of parallel incorgruous multi-screw extruder, reduce the power of motor.
between the right-hand member and driving screw core inner face of inner screw, have exhaust clearance, the gas (high-temperature gas or steam etc.) entered in inner screw by the second through hole can enter in exhaust passage from this gap, and then is discharged outside machine barrel by the two ends of exhaust passage.
compared with prior art the invention has the beneficial effects as follows.
(1) extrusion pressure is large: the inner screw set up becomes longer and stable metering section, and this equals the draw ratio increasing screw rod, so improve extrusion pressure.
(2) plasticizing capacity strengthens: on driving screw, liquid phase is separated all, and is derived from the second through hole in time, the width that solid phase width occupies whole screw channel is large, therefore, has maximum melt surface, improve fusion plastification ability, consequently increase output.
(3) energy consumption reduces, energy-saving effect is remarkable: the present invention is compared with some extruders of the prior art, and as 150 extruders adopted 132-160KW motor in the past, the present invention adopts 55KW motor namely can reach equal production volume plastics.
(4) material feeding performance is good: material feeding section have employed non-engaging twin-screw, therefore improves material feeding performance.
(5) exhaust performance is good: be vented carry out simultaneously owing to structure of the present invention have employed solid phase compression exhaust and melt zone, inner screw right-hand member has longer exhaust space, so exhaust effect is good.
(6) anti-risk material property can be good: inner screw has longer exhaust length and space, and fused materials stores material in this section, and can automatically regulate storing amount.
(7) screw rod is easy to process: driving screw is from compression section, and adding an added thread becomes two screw thread, but the pitch of added thread is equal with main thread, and this brings great convenience with regard to giving the processing of screw rod; Inner screw also adopts single thread to process easily.
(8) various plastics and rubber processing is applicable to: with regard to inner screw in the present invention, its diameter is smaller compared with driving screw, screw channel is darker, therefore on inner screw, suffered shearing of melt is less, the material of melting enters after inner screw no longer by barrel heat (temperature of screw rod is generally always lower than the temperature of machine barrel), this guarantees melt and not easily cross thermal decomposition, so be applicable to the multiple thermoplastic and the rubber processing that comprise easy decomposing materials.
Accompanying drawing explanation
fig. 1 is structural representation of the present invention.
in figure, 1 be frame, 2 be reduction box, 3 be shaft coupling, 4 be drive motors, 5 be distributor box, 6 be drawing-in device, 7 be feed end, 8 be material feeding section, 9 be machine barrel, 10 be sub-screw, 11 be driving screw, 12 be inner screw, 13 be exhaust passage, 14 be end cap, 15 be discharge end, 16 be hopper, 17 be driving gear, 18 for driven gear.
fig. 2 is the structural representation of machine barrel of the present invention.
in figure, 19 is that compression section, 20 is for melt zone.
fig. 3 is the A portion enlarged drawing of Fig. 2.
in figure, 21 is two screw threads for single thread, 22 is the first through hole, 23.
fig. 4 is the B portion enlarged drawing of Fig. 2.
in figure, 24 be the second through hole, 25 be exhaust outlet, 26 be melt outlet, 27 for screw channel.
Detailed description of the invention
as shown in Figure 1, extruder of the present invention comprises frame 1, frame 1 is arranged drive motors 4 and reduction box 2, reduction box 2 is connected with the distributor box 5 on the left of it by shaft coupling 3, the drawing-in device 6 be positioned on distributor box 5 is corresponding to the top of hopper 16, the below of hopper 16 is corresponding to the feed end 7 of machine barrel 9 on the left of distributor box 5, the discharge end 15 of machine barrel 9 is provided with end cap 14, the built-in driving screw of machine barrel 9 11 and be positioned at feed end 7, the sub-screw 10 contrary with driving screw 11 hand of spiral, driving screw 11 and sub-screw 10 are connected with the driving gear 17 in distributor box 5 and driven gear 18 respectively, left section of driving screw 11 is hollow structure, and built-in left end is fixed on the inner screw 12 on end cap 14, and the screw thread of inner screw 12 is contrary with the hand of spiral of driving screw 11, have exhaust passage 13 in right section of driving screw 11, described exhaust passage communicates with the exhaust passage 13 in inner screw 12, screw thread on the driving screw 11 corresponding to sub-screw 10 is single thread 21, and in addition, on driving screw 11, screw thread is two screw threads, driving screw 11 between two screw thread two spiral shell rib is provided with the first through hole 22 that same exhaust passage 13 is connected, between two spiral shell ribs of the driving screw 11 pairs of screw threads outside inner screw 12, is provided with some second through holes 24, end cap 14 is provided with the melt outlet 26 communicated with cavity between driving screw 11 and inner screw 12, and the exhaust outlet 25 be connected with exhaust passage 13.
as in Figure 2-4, be structural representation and the partial enlarged drawing of machine barrel 9 of the present invention and associated components.The incorgruous interior rotation of extruder main screw rod 11 of the present invention and sub-screw 10 is that driving gear 17 by arranging in distributor box 5 and driven gear 18 realize; Wherein, driving gear 17 is connected with driving screw 11, and driven gear 18 is connected with sub-screw 10, thus makes driving screw 11 and sub-screw 10 reach counter rotating.And inner screw 12 is owing to being fixed on the end cap 14 of machine barrel 9, therefore inner screw 12 maintains static.In machine barrel 9, each parts can be divided into three sections in different phase role, i.e. material feeding section 8(solid conveying section), compression section 19 and melt zone 20(metering section).Material feeding section 8 is change two screw thread 23 from the screw thread on machine barrel 9 feed end 7 to driving screw 11 into by single thread 21.After plastics to be processed enter this section, accept twin-screw extruding forwards and advance.19, compression section from driving screw 11 with two screw thread, its length is 2-5 times of driving screw 11 diameter, gas (cryogenic gas) in solid plastic enters into rapidly the exhaust passage 13 in right section of driving screw 11 from the first through hole 22 driving screw 11 between two screw thread 23, discharged outside machine barrel 9 by the left end of exhaust passage 13 or right-hand member.The plastics continuing to push ahead enter melt zone 20, under the heat effect of external heat and mechanical friction, rapid melting, to enter between driving screw 11 and inner screw 12 in cavity from the second through hole 24 driving screw 11 between two spiral shell ribs, thus liquid phase is separated with solid phase, and derive from the melt outlet 26 machine barrel 9 left end end cap 14; Solid phase is then deposited in the screw channel 27 between adjacent two pairs of screw threads 23, and because the area of screw channel 27 is comparatively large, therefore have maximum melt surface, improve melting rate, its result also increases output; The solid phase of non-melting continues melting, finally also melts for liquid phase, discharges from melt outlet 26.

Claims (6)

1. the parallel incorgruous multi-screw extruder of exhaust in a kind, comprise frame (1), frame (1) is arranged drive motors (4) and reduction box (2), reduction box (2) is connected with the distributor box (5) on the left of it by shaft coupling (3), drawing-in device (6) on distributor box (5) is corresponding to the hopper (16) below discharging opening, the below of hopper (16) is connected with the feed end (8) of distributor box (5) left side machine barrel (9), the discharge end (15) of machine barrel (9) is provided with end cap (14), machine barrel (9) built-in driving screw (11) and be positioned at feed end (7), the sub-screw (10) contrary with driving screw (11) hand of spiral, driving screw (11) and sub-screw (10) are connected with the driving gear (17) in distributor box (5) and driven gear (18) respectively, it is characterized in that:
The left end of driving screw (11) is hollow structure, and built-in left end is fixed on the inner screw (12) on end cap (14), and the screw thread of inner screw (12) is contrary with the hand of spiral of driving screw (11); Have exhaust passage (13) in the right-hand member of driving screw (11), described exhaust passage (13) communicate with the exhaust passage (13) in inner screw (12); Be single thread (21) with the screw thread on the corresponding driving screw (11) of sub-screw (10), in addition, the upper screw thread of driving screw (11) be pair screw threads (23) except feed end; The first through hole (22) that between two spiral shell ribs of two screw thread (23), bottom and driving screw (11) central bore have same exhaust passage (13) to communicate, is provided with some second through holes (24) between two spiral shell ribs of inner screw (12) driving screw outward (11) two screw thread; End cap (14) is provided with the melt outlet (26) communicated with cavity between driving screw (11) and inner screw (12), and the exhaust outlet (25) be connected with exhaust passage (13).
2. the interior parallel incorgruous multi-screw extruder of exhaust as claimed in claim 1, it is characterized in that: the screw thread on sub-screw (10) is single thread (21), and sub-screw (10) and driving screw (11) is incorgruous interior rotation.
3. the interior parallel incorgruous multi-screw extruder of exhaust as claimed in claim 2, is characterized in that: sub-screw (10) is short screw, and with driving screw (11) for non-engagement is installed.
4. the interior parallel incorgruous multi-screw extruder of exhaust as claimed in claim 1, is characterized in that: the screw thread of described inner screw (12) is single thread (21).
5. the interior parallel incorgruous multi-screw extruder of exhaust as claimed in claim 1, is characterized in that: the helical pitch between the upper adjacent two pairs of screw threads (23) of described driving screw (11) is equal with the helical pitch between adjacent two single threads (21).
6. the interior parallel incorgruous multi-screw extruder of exhaust as claimed in claim 1, is characterized in that: between the right-hand member and driving screw (11) core left end of inner screw (12), have certain exhaust clearance.
CN201210406352.8A 2012-10-23 2012-10-23 Internal exhaust type parallel counter-rotating multi-screw extruder Expired - Fee Related CN102886888B (en)

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103895209B (en) * 2014-03-06 2016-04-06 东莞市三优塑料机械制造有限公司 Parallel counter rotation twin screw extruder
CN103831965A (en) * 2014-03-27 2014-06-04 常州大学 Method and device for adjusting pressure of exhaust type screw extruder
CN109849307A (en) * 2019-04-11 2019-06-07 宁波安力电子材料有限公司 A kind of high viscosity molded composites single screw extrusion machine
CN114474649B (en) * 2022-02-11 2022-11-04 安徽戴家工艺有限公司 Wood-plastic plate forming equipment and forming process

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Publication number Priority date Publication date Assignee Title
US4802140A (en) * 1987-04-29 1989-01-31 Eastman Kodak Company Method and molding screw for injection molding
CN101842214A (en) * 2007-10-29 2010-09-22 特乐斯特有限及两合公司 Device and method for processing of polymer materials
CN202826362U (en) * 2012-10-23 2013-03-27 金世源 Internal air-exhaust-type parallel counter-rotating multi-screw extruder

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US6164810A (en) * 1998-09-16 2000-12-26 Eastman Kodak Company Vented single stage barrier screw with a gas vent hole and axial bore in the screw for venting gases

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US4802140A (en) * 1987-04-29 1989-01-31 Eastman Kodak Company Method and molding screw for injection molding
CN101842214A (en) * 2007-10-29 2010-09-22 特乐斯特有限及两合公司 Device and method for processing of polymer materials
CN202826362U (en) * 2012-10-23 2013-03-27 金世源 Internal air-exhaust-type parallel counter-rotating multi-screw extruder

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